Antenna



FIG. 1 is a perspective view of an antenna showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a front view thereof.

CLAIM The ornamental design for an antenna, as shown and described.